According to an expert, Prince Harry’s new book on life in the royal family will “further damage” his relationship with his brother William and father Charles.

The Duke of Sussex, 36, has been writing a book on his life as a royal in secret.

It will chronicle his life from his upbringing in palaces through his service in Afghanistan and his choice to quit the royal family in 2020. According to sources close to Prince Charles, Harry’s father was ‘surprised’ by the news, and the royals had not been informed about the book until it was announced this week.

The book, according to royal analyst Robert Jobson, will only “lead to conflict” and may be “hugely damaging” to the House of Windsor and the monarchy.

“It will become an international bestseller, but at what cost to the monarchy? There will be nowhere to hide,” royal analyst Robert Jobson told FEMAIL.

“This is bound to cause mayhem amongst the House of Windsor.

“If Harry, which seems inevitable, goes into detail about mental health issues involving his wife and alleged racism at the heart of the royal family, it will be hugely damaging to the House of Windsor and the Monarchy as an institution.

“Harry is already hugely rich and famous so apart from damaging his family – which a book like this will inevitably do, I am not sure what he is trying to achieve.

“Whatever he says will lead to conflict. No wonder there is a rift between the royal brothers and problems with his father.

“How can any bridges be built when he is doing this?”

The brothers have been estranged since William allegedly kicked Harry and Meghan out of Kensington Palace in March 2019 over alleged staff bullying, prompting the Sussexes to disband their joint foundation and establish a new office at Buckingham Palace.

Following that, the Sussexes established their new office in Buckingham Palace.

The allegations were made public in Robert Lacey’s book Battle of Brothers, which was released before Harry and Meghan went on Oprah to accuse the Royal Family of racism and say they were abandoned when Meghan was suicidal and six months pregnant.

The book will be published in time for the Queen’s Platinum Jubilee in 2022, according to Harry.

Harry seemed to make a veiled jab at the monarchy in his statement, saying he is “writing this not as the prince I was born but as the man I’ve become”

Richard Fitzwilliams, a royal specialist, told FEMAIL that Harry utilizes public appearances as a “form of therapy.”

‘It’s not being published globally until late 2022. I do think that it is very important that an accommodation should be reached between the royal family and the Sussexes between now and then.

‘He is donating the proceeds to charity. It is however worth remembering that the knowledge he is writing it, and that it could be explosive and that it will be widely read worldwide, is something members of the royal family will be bearing in mind when dealing with the Sussexes between now and then.

‘The Sussexes problem is they keep going public. Harry has an extraordinary habit of getting headlines – Oprah, James Corden, celebrity podcasts, AppleTV and he sees these appearances as a kind of therapy.

‘It’s very difficult when you’re dealing with the Sussexes, that you don’t know what’s coming next. It might not be published until 2022.

‘It’s so far in the future, it’s a potential lever if they want something from the royal family.

‘He’s exorcising his demons, and he doesn’t see it as disruptive at all. He sees it as becoming a new person – escaping being trapped like Charles and William.

‘But he’s still sixth-in-line to the throne, a significant royal even if he’s not a working royal.

‘He wants an audience to understand how he can become a new him, and we don’t know that will be yet.

‘Will it be his truth or the truth? And will they be the same or different?

‘A lot of his Oprah interview didn’t pass a fact check, and it’s difficult for the outside world to tell what is true, which is a big concern.

‘They still see themselves as victims , my hope is that it’s constructive and won’t lead to further revelations that will damage his family

‘It appears it was written before the rift was healed – so it could be extraordinary.

‘He’s saying the book is written from the perspective of ‘the man he’s become’, and this is certainly what he feels at the moment.

‘It’s hard to see exactly what Harry and Meghan want and we might not know until we see what in the memoir is going to include and what might embarrass his father and what’s going to be about their time as working royals.

‘He has talked a lot about healing, but what do the Sussexes want from the royal family?’

The revelation was reported to have taken the royal family totally off guard.

According to reports, Harry has been working on the book for nearly a year, with a manuscript expected to be submitted to publishers next month.